Revert "Roll src/third_party/fontconfig/src/ 8f169b6a9..09ee17b85 (3 commits)"

This reverts commit d44fb92ddf97a649de1e24eb2b216d7ccb0cb3e5.

Reason for revert: Caused tree closure. See https://ci.chromium.org/ui/p/chromium/builders/ci/linux-cast-arm-rel/38911/overview.

Bug: chromium:349952802
Original change's description:
> Roll src/third_party/fontconfig/src/ 8f169b6a9..09ee17b85 (3 commits)
>
> https://chromium.googlesource.com/external/fontconfig.git/+log/8f169b6a9c6b..09ee17b858c0
>
> $ git log 8f169b6a9..09ee17b85 --date=short --no-merges --format='%ad %ae %s'
> 2025-07-24 drott [Fontations] Remaining fix for UaF
> 2025-07-18 akira Add fontconfig version in FcCache
> 2025-07-18 akira meson: Add a missing fontconfig architecture test case
>
> Created with:
>   roll-dep src/third_party/fontconfig/src
>
> Bug: chromium:349952802
> Change-Id: Icbf44e1c7313e65b783464ba48053e0f8840153c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6797150
> Auto-Submit: Dominik Röttsches <drott@chromium.org>
> Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1493859}

Bug: chromium:349952802
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I6da6d5222070db5325ec7e5d56211f9f56607b6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6799105
Auto-Submit: Andy Phan <andyphan@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Andy Phan <andyphan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1493863}
NOKEYCHECK=True
GitOrigin-RevId: 71c9f77f9d079c316eef0d86a0bc6e68e58f6b22